Effect

Generation II

Giga Drain will inflict damage on the target and ½ of the damage dealt will be restored to the user as HP.

The base PP of Giga Drain is 5 in this generation.

Generation III

Functions the same as Generation II, however, when used on a Pokémon with the Liquid Ooze ability, the user will lose the amount of HP it would have gained instead.

Generation IV

The move's base PP was raised to 10. If the user has the Big Root as its held item, The user will receive 30% more HP than it would have. Big Root does not increase damage dealt. All other effects remain the same.

Generation V

The functions are the same as previous generations, however, the base power is increased from 60 to 75.

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| colspan="6" | Bold indicates a Pokémon which gets STAB from this move.Italic indicates a Pokémon whose evolution gets STAB from this move.*Indicates Pokémon that can only learn the move through chain breeding.
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| colspan="6" | Bold indicates a Pokémon which gets STAB from this move.Italic indicates a Pokémon whose evolution gets STAB from this move.*Indicates Pokémon that can only learn the move through chain breeding.
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| colspan="6" | Bold indicates a Pokémon which gets STAB from this move.Italic indicates a Pokémon whose evolution gets STAB from this move.*Indicates Pokémon that can only learn the move through chain breeding.
|}
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| colspan="6" | Bold indicates a Pokémon which gets STAB from this move.Italic indicates a Pokémon whose evolution gets STAB from this move.*Indicates Pokémon that can only learn the move through chain breeding.
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The three mountains on Torterra's back glow green. Glowing green energy beams then extend from the tops of the mountains at the opponent and wrap it up. Torterra then drains energy from the opponent. The energy beams go back into the mountains on Torterra's back when the attack is complete.

Ninjask's body glows green and it flies above the opponent. It then starts flying in circles above the opponent's head, leaving behind a turquiose trail of energy as it does. Finally, when a turquiose circle appears above the opponent's head, Ninjask's eyes start to glow red while still spinning around and green static comes off the circle and hits the opponent, and its body glows green as the energy gets drained from it.